PULSEUnderground Intel

LIVE38signals / 24h

FEED

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CVE Watch—

CVE-2021-28799

QNAP NAS Improper Authorization Vulnerability

CVSS

—

No CVSS

EPSS

78.3%

p100

KEV

YES

Mar 31, 2022

Exploit Today

80

0-100

Published: — · Last modified: —

EPSS · 30d

78.3%EPSS · 30 days78.3%

2026-09-172026-10-15

KEV catalog record

Product

QNAP / Network Attached Storage (NAS)

Vulnerability

QNAP NAS Improper Authorization Vulnerability

Added to KEV

Mar 31, 2022

Remediate by

Apr 21, 2022

Known ransomware use

Yes

Summary description

QNAP NAS running HBS 3 contains an improper authorization vulnerability which can allow remote attackers to log in to a device.

Required action

Apply updates per vendor instructions.

Notes

https://nvd.nist.gov/vuln/detail/CVE-2021-28799

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